Definition
Thin strips of metal foil, metallized film, or metal-coated fibers released into the air by military aircraft to reflect radar signals. Chaff produces clusters of false returns on radar displays, used to confuse or screen aircraft from radar tracking during training exercises or actual operations.
Plain English
Tiny reflective strips dropped from military aircraft to scatter radar signals, creating fake blips on radar screens.
Context Anchor
Pilots may see chaff mentioned in FAA material, military activity notices, or radar and weather displays where a drifting return is not rain, snow, or an aircraft.
Derivation
From Old English 'ceaf,' meaning the husks of grain separated from the seed during threshing. The aviation term borrows the image: light, fluttering material scattered through the air, just as chaff drifts away from grain when winnowed.
Why Pilots Care
It provides an immediate, non-kinetic way to defeat or degrade radar-guided missile or gun threats during evasive maneuvers.
Analogy
Like tossing a handful of shiny confetti into a flashlight beam so the light bounces back from dozens of points instead of one clear spot.
Intuition Check
Chaff does not mean grain husks in aviation. Here it means tiny radar-reflecting material released into the air to create misleading radar returns.
Example Sentence 1
ATC advised that chaff was being released along the military training route, and several false returns appeared on the controller's scope.
Example Sentence 2
Radar operators saw a cloud of chaff on their scopes and could no longer distinguish the actual aircraft track.